For rohan.

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Garrozar

Posts : 2Join date : 2010-02-18

Subject: For rohan. Tue Mar 09, 2010 7:01 am

4. Two smooth spheres a and b of equal radii and m*** of 750g and 1kg respectively are initially at rest on a smooth horizontal surface. A is projected directly towards b with speed 5ms-1 and after collision a has not changed its direction of motion but has a speed of 1ms-1 . The collision sets b into motion and it goes on to strike a fixed wall at right angles, the impact reversing b's direction of motion and halving its speedb then collides a***n with a and this collision reduces b to rest. find the final speed of a and the total loss in kinetic energy due to the collisions

Garrozar

Posts : 2Join date : 2010-02-18

Subject: Re: For rohan. Tue Mar 09, 2010 7:06 am

Question 2. When a powered vehicle with a mass of 4 tonne climbs a road with a gradient of 1 in 7 at a constant speed of 55kmh-1 the power consumption is 89kW. The total resistive force is constant and independent of speed and gradient.Using energy methods, calculate the following:A)The freewheeling distance to rest up the gradient after the power is cut off.B)The freewheeling distance to rest on a level stretch of the same road after cut off at 55kmhC)The total distance of freewheeling to rest, back down the slope from the stopped position in (a), assuming that after travelling the distance found in (a) the vehicle freewheels back down the slope to find the foot of the gradient and thence along the level road.D)the deceleration whilst travelling up the slope with the power off